First Day of Spring 2023: The Spring Equinox

In the Northern Hemisphere, the spring equinox in the Northern Hemisphere (also called the March equinox or vernal equinox across the globe) occurs when the Sun crosses the celestial equator going south to north. It’s called the “celestial” equator because it’s an imaginary line in the sky above the Earth’s equator. Imagine standing on the equator; the Sun would pass directly overhead on its way north.